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(FILES) In this file photo taken on November 18, 2020 shows a bottle reading "Vaccine Covid-19" next to the Moderna biotech company logo. - The Pfizer and Moderna Covid vaccines could be approved in a matter of weeks, but who in the United States will get them first? Though nothing has yet been decided, US experts may differ from other countries in prioritizing "critical workers" who keep society running -- potentially even before people at highest risk. To be clear, there won't be one single set of rules for the whole nation. (Photo by JOEL SAGET / AFP) / -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE --